Sökning: "Ballast stiffness"

Visar resultat 1 - 5 av 17 uppsatser innehållade orden Ballast stiffness.

1. 1. Reliability-Based Sensitivity Analysis of the Dynamic Response of Railway Bridges

   Master-uppsats, KTH/Bro- och stålbyggnad

   Författare :Hasan Al-Zubaidi; [2022]
   Nyckelord :Railway bridges; High-speed trains; Simply supported beam; Global sensitivity analysis; Uncertainty quantification; Reliability; Ballast instability; Running safety; Passenger comfort;

   Sammanfattning : In response to the planned increase in operational speeds and axle loads of passengertrains that may lead to resonance-induced excessive vibrations in railway bridges,recent studies examined the reliability of bridges concerning train running safety andpassenger comfort limit states. In this respect, valuable information regarding theimportance of input variables can be obtained by conducting Sensitivity Analysis (SA). LÄS MER

3. 2. Influence of load distribution on trough bridges

   Master-uppsats, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

   Författare :Jacob Gustafsson; [2021]
   Nyckelord :Bridge; Trough bridge; Concrete; Load distribution; Ballast;

   Sammanfattning : There are approximately 4000 railway bridges in Sweden and a common construction type is the short span concrete trough bridge. With the current standards the load distribution through ballast is assumed to be uniformly distributed with a distribution slope of 2:1 according to the Swedish Administration of Transport or 4:1 according to Eurocode 1. LÄS MER

4. 3. Användning av alternativa material i vägkonstruktioner

   Kandidat-uppsats, Lunds universitet

   Författare :Jonathan Jingfors; André Nilsson; [2018]
   Nyckelord :alternativa material; krossad betong; krossad asfalt; hyttsten; masugnsslagg; alternative materials; crushed concrete; crushed asphalt; air cooled blast furnace slag; blast furnace slag; ; Technology and Engineering;

   Sammanfattning : The report is based on the use of alternative materials in road construction. The alternative materials included are crushed concrete, crushed asphalt and air cooled blast furnace slag. Differences and similarities exist between the use of alternative materials in Sweden and Denmark. LÄS MER

5. 4. Train Induced Vibration Analysis of an End-frame Bridge : Numerical Analysis on Sidensjövägen

   Master-uppsats, KTH/Bro- och stålbyggnad

   Författare :Niklas Wiberg; Jasmin Halilovic; [2018]
   Nyckelord :Accelerations; Dynamics; End-frame bridge; FE-modeling; Frequency response function; High-speed railway; Soil structure interaction; Train induced vibrations; 2D 3D;

   Sammanfattning : Higher speeds and higher capacity will cause the Swedish rail network to be exposed to disturbing dynamic effects. Higher speeds cause higher vertical acceleration levels of the bridge deck. In this thesis, a numerical analysis of a three span end-frame bridge subjected to train induced vibrations is performed. LÄS MER

7. 5. High-speed railway embankments : a comparison of different regulation

   Master-uppsats, KTH/Jord- och bergmekanik

   Författare :Angelica Alamaa; [2016]
   Nyckelord :High-speed; railway; embankments;

   Sammanfattning : Swedish transport administration initiated this Master Thesis project and the aim was to compare regulations for the design of high-speed railways from three European countries: France, Germany and Spain. The reason why this is of interest for the Swedish transport administration is the design of the first Swedish high-speed railway, called Ostlänken. LÄS MER